Added the ability to rename wiki pages (specific permission required).

Existing links that point to the old page are preserved and automatically redirected to the new page (this behaviour can be disabled when renaming the page).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@720 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/wiki.rb

@@ -18,6 +18,7 @@
 class Wiki < ActiveRecord::Base
   belongs_to :project
   has_many :pages, :class_name => 'WikiPage', :dependent => :destroy
+  has_many :redirects, :class_name => 'WikiRedirect', :dependent => :delete_all
   
   validates_presence_of :start_page
   validates_format_of :start_page, :with => /^[^,\.\/\?\;\|\:]*$/
@@ -25,14 +26,20 @@ class Wiki < ActiveRecord::Base
   # find the page with the given title
   # if page doesn't exist, return a new page
   def find_or_new_page(title)
-    title = Wiki.titleize(title || start_page)
-    find_page(title) || WikiPage.new(:wiki => self, :title => title)  
+    find_page(title) || WikiPage.new(:wiki => self, :title => Wiki.titleize(title))
   end
   
   # find the page with the given title
-  def find_page(title)
+  def find_page(title, options = {})
     title = start_page if title.blank?
-    pages.find_by_title(Wiki.titleize(title))
+    title = Wiki.titleize(title)
+    page = pages.find_by_title(title)
+    if !page && !(options[:with_redirect] == false)
+      # search for a redirect
+      redirect = redirects.find_by_title(title)
+      page = find_page(redirect.redirects_to, :with_redirect => false) if redirect
+    end
+    page
   end
   
   # turn a string into a valid page title

app/models/wiki_page.rb

@@ -22,13 +22,39 @@ class WikiPage < ActiveRecord::Base
   has_one :content, :class_name => 'WikiContent', :foreign_key => 'page_id', :dependent => :destroy
   has_many :attachments, :as => :container, :dependent => :destroy
   
+  attr_accessor :redirect_existing_links
+  
   validates_presence_of :title
   validates_format_of :title, :with => /^[^,\.\/\?\;\|\s]*$/
   validates_uniqueness_of :title, :scope => :wiki_id, :case_sensitive => false
   validates_associated :content
-  
+
+  def title=(value)
+    value = Wiki.titleize(value)
+    @previous_title = read_attribute(:title) if @previous_title.blank?
+    write_attribute(:title, value)
+  end
+
   def before_save
-    self.title = Wiki.titleize(title)
+    self.title = Wiki.titleize(title)    
+    # Manage redirects if the title has changed
+    if !@previous_title.blank? && (@previous_title != title) && !new_record?
+      # Update redirects that point to the old title
+      wiki.redirects.find_all_by_redirects_to(@previous_title).each do |r|
+        r.redirects_to = title
+        r.title == r.redirects_to ? r.destroy : r.save
+      end
+      # Remove redirects for the new title
+      wiki.redirects.find_all_by_title(title).each(&:destroy)
+      # Create a redirect to the new title
+      wiki.redirects << WikiRedirect.new(:title => @previous_title, :redirects_to => title) unless redirect_existing_links == "0"
+      @previous_title = nil
+    end
+  end
+  
+  def before_destroy
+    # Remove redirects to this page
+    wiki.redirects.find_all_by_redirects_to(title).each(&:destroy)
   end
   
   def pretty_title

app/models/wiki_redirect.rb

@@ -0,0 +1,23 @@
+# redMine - project management software
+# Copyright (C) 2006-2007  Jean-Philippe Lang
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+class WikiRedirect < ActiveRecord::Base
+  belongs_to :wiki
+  
+  validates_presence_of :title, :redirects_to
+  validates_length_of :title, :redirects_to, :maximum => 255
+end